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Boxrec has him down at only 5 5' 1/2
Wiki has him down at 5'6
Lineal championships mean absolutely nothing these days and haven't for a long time mate, some of the people who have held that 'honour' have actually been utter rubbish compared to other fighters in the same division.
8 world championships in different divisions, with more divisions than ever before, compare that to the achievements of the likes of Henry Armstrong, Duran, Chavez, Leonard etc
I can easily name a fighter historically who would have absolutely outclassed him in each division he has fought and been rated 'champion' in
He's a 'modern' great, in a time when boxing has been on it's arse talent wise for 10 years or more and the amount of divisions and titles dilute the quality you have to face to a ridiculous degree (and the talent around now is a shadow of what it was in prior eras of the sport)